procesing and requiring that src != dst.
(cbc_decrypt): Use cbc_decrypt_internal. If src == dst, use a
buffer of limited size to copy the ciphertext.

Rev: src/nettle/cbc.c:1.5

iv.

Rev: src/nettle/cbc.c:1.4

Rev: src/nettle/ChangeLog:1.17
Rev: src/nettle/cbc.c:1.3

Rev: src/nettle/Makefile.am:1.12
Rev: src/nettle/cbc.c:1.2
Rev: src/nettle/cbc.h:1.2

Rev: src/nettle/cbc.c:1.1
Rev: src/nettle/cbc.h:1.1